Apparatus for concentrating ore.



P. H. CRAVEN.

APPARATUS FOR GONGENTRATING ORE.

APPLICATION FILED MAY 17, 1910.

1,060,323.. Patented Apr. 29, 1913.

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WITNESSES INVENTOR nurt44jc /M' a y ATTORNEYS P. H. CRAVEN.

APPARATUS FOR GONGENTRATING ORE.

APPLICATION FILED MAY 17, 1910.

1 610,323, Patented Apr. 29, 1913.

I Q 6 SHEETS-SHEET 2.

ATTORNEYS P. H. CRAVEN.

APPARATUS FOR CONGBNTRATING ORE.

APPLICATION FILED MAY 17, 1910.

1,060,323, Patented Apr. 29, 1913.

6 SHEETS-SHEET 3.

Y ATTORNEYS COLUMBIA PLANOGRAPH co vmsnmumu. DQAC,

P.H.GRAVEN. APPARATUS FOR OONGENTRATING ORE APPLICATION FILED MAY 17,1910.

'. 1,060,323. PatentedApr.29,1913.

6 QHEETS-SHEBT 4.

WITNESSES ATTORNEYS WITNESSES COLUMBIA PLANUURAPH c0..w/\smNuTON. D. c.

Patented Apr. 29, 1913.

6 SHEETS-SHEET 5.

INVENTOR P. H. CRAVEN.

APPARATUS FOR GONOENTRATING ORB.

AAAAAAAAAAAAAAAAAAAAAAAAA 0. 1 1,060,323. Patented Apr. 29, 1913.

EETS SHEET 6 INVENTOR WITNESSES ATTORNEYS COLUMBIA PLANOORAPH cu, WASHLNuuuuuuu c.

PETER H. CRAVEN, 0F SPOKANE, WASHI CHINERY COMPANY, OF SPOKANE, W

INGTON.

NGTON, ASSIGNOR TO 1?. H. CRAVEN MA- ASHINGTON, .A CORPORATION OF WASH-APPABATUS FOR CONCENTRATING ORE.

acrosse.

Specification of Letters Patent.

Patented Apr. 29, 1913.

Application filed May 17, 1910. Serial No. 561,868.

To all whom it may concern:

Be it known that I, PETER H. CRAVEN, a citizen of the United States,residing in the city and county of Spokane, State of Washington, haveinvented a new and useful Apparatus for Concentrating Ore, of which thefollowing is a specification.

My present invention consists of a novel apparatus for concentratingores, by the emloyment of which a much larger proportion of the lightparticles of the ore is saved than has heretofore been deemed possible.

One of the objects of my invention is to impart to the concentratorsurface a continuous travel, such in the present instance being causedby the friction or cohesion of the concentrator belt and the slattedbelt, which latter is positively driven preferably by means of africtional driving mechamsm.

Another object of my invention is to obtain a perfect continuous orinclined surface, the slotted belt being positively driven and owing tothe manner in which the concentrator belt is mounted on the slattedbelt, a slight slippage between the slats and the concentrator belt ispermitted so that a concentrator surface is provided which forms aperfect inclined plane, permitting no valleys or depressions atintervals between the slats and this surface is perfectly uniformthroughout the ore dressing zone and relatively uniform throughout. theore washing zone, it being understood that the dividing line betweenthese two zones may be varied as desired, in accordance with theconditions and requirements.

Another object of my invention is to provide a novel means forsupporting the concentrator belt and novel means for adjusting theinclination of such belt.

With the above and other objects in view which will be hereinafter moreparticularly referred to, my present invention consists of a novelapparatus for concentrating wherein the concentrating surface travels ina transversely inclined plane and afterward in a transversely andlongitudinally inclined plane.

My invention further consists of a novel apparatus for concentratingores, wherein the concentrator surface is caused to continuously travelin a longitudinal direction, the ore being fed in proximity to the upperedge of a transversely inclined belt, shaped at its upper edge toprevent any back splashing and at its lower edge so as to afford acontinuous vertical dripping edge, the ore being fed in such a mannerand under such conditions as to permit a partial separation of themetallic content from the gangue to take place on the transverselyinclined portion.

My invention further consists of novel means for adjusting thelongitudinal and transverse pitch of the concentrator belt.

My invention further consists of a novel construction of an apparatusfor concentrating wherein the entire machine is yieldingly supported,provision being made for causing the concentrator surface to be transversely inclined during a portion of its travel and transversely andlongitudinally inclined during the next stage of its travel, and novelmeans being provided for causing the desired transverse and longitudinalflow of the wash and pulp waters.

My invention further consists of novel means for causing theconcentrating surface to travel in a transversely inclined plane duringthe first stages of the concentrating operation and then through atransversely longitudinally inclined plane, during which lattermovement, means is provided for raising the lower edge of theconcentrator sur face to prevent the wash water flowing over the sidethereof.

It further consists of novel means for adjusting the friction feed.

My invention further consists of novel means for causing the travel ofthe concentrator surface and novel means for removing the concentratetherefrom.

My invention further consists of a novel construction for guiding theslatted belt during its travel and preventing buckling and unnecessarywear.

My invention further consists of a novel construction of supportingbracket, which co-acts with the frame work of the machine in a novelmanner.

It further consists of a novel manner of adjustably mounting thejournals of the concentrator belt shaft and the slatted beltshaftwhereby the slatted belt and the concentrator belt will have the propertension.

It further consists of other novel features of construction, all as willbe hereinafter fully set forth.

For the purpose of illustrating my invention, I have shown in theaccompanying drawings one form thereof which is at present preferred byme, since the same has been found in practice to give satisfactory andreliable results, although it is to be understood that the variousinstrumentalities of which my invention consists can be variouslyarranged and organized and that my invention is not limited to theprecise arrange ment and organization of these instrumentalities asherein shown and described.

Figure 1 represents a side elevation of a portion of an oreconcentrating device embodying my invention, the same being viewed fromthe lower side. Fig. 2 represents a sectional view of a portion of thedevice showing more particularly the manner in which the slatted belt isguided. Fig. 3 represents a perspective view of one of the guide memberscarried by the slats of the slatted belt. Fig. & represents a sideelevation of the right hand portion of my machine, the same being viewedfrom the lower side. Fig. 5 represents a plan view of the left handportion of the machine, certain part-s thereof being removed for thesake of clearness of illustration. Fig. 6 represents a plan view of theright hand portion of the machine, certain parts thereof being removedfor the sake of clearness of illustration. Fig. 7 represents atransverse section of the machine looking toward the left. Fig. 8represents a perspective view of the ore concentrator belt in detachedposition, showing the Zones which' it forms. during its travel andshowing in addition, the manner in which the lower edge of theconcentrator belt is raised during a portion of its travel. Fig. 9represents a sectional view of a portion of the machine showing moreparticularly the means for adjusting the pitch of the concentratingsurface. Fig. 10 represents a sectional view of a portion of the device,showing more particularly the manner in which the friction of thedriving mechanism may be adjusted. 'Fig. 11 represents a sectional view,showing more particularly the type of journal employed.

Similar numerals of reference indicate corresponding parts in thefigures.

Referring to the drawings :1 designates standards on which are mountedthe channels 2 to which latter are secured the brackets or angle bars 3.

The machine is so constructed as to afford a firm base fixed at suitablepoints so as to obtain the desired transverse and longitudinal flows.

4 designates a desired number of vertically arranged springs the lowerends of which are secured to the angles 3 by means of suitable fasteningdevices 5, the upper ends of said springs being secured to the brackets6 by means of suitable fastening devices 7. Any desired number ofsprings may be employed but, in the present instance, I preferablyemploy three springs located on each side of the machine therebyproviding six points of support for the operating mechanism. Thebracket-s 6 are bolted or otherwise secured to the lower frame-work 8and also to the upper frainework 9.

"10 designates a bracket which is carried by the upper frame-work 9,said bracket having mounted thereon the journal boxes 11, in which ismounted a shaft 12, on which are mounted a plurality of sprocket wheels13. The opposite end of the frame is provided with a bracket 14 in whichis mounted the journal boxes 15, the latter being adapted to receive theshaft 16 to which are secured a plurality of sprocket wheels 17 18designates a slatted belt the same consisting, in the present instance,of the sprocket chains 19 to which are secured transversely extendingslats 20. One end of each of the slats 20 is upwardly deflected asindicated at 21. The slats 20 may be made of any desired material and ifmade of metal it is preferable in some cases to deflect the sidesthereof downwardly, as indicated at 22, in order to reinforce the same.The ends of the slats 2O opposite to the deflected ends 21 curvedownwardly from their upper surface, as is clearly shown at 23. In orderthat the slatted belt 18 may be properly guided in its movement theslats 20 thereof have secured thereto the brackets 24, each of which isprovided with a contact face or shoe 25, which travels upon the contactface 26 of a guide bracket 27, which latter is carried by the upperframe work 9, it being most clearly seen in Fig. 2 that the lower edgeof the bracket is provided with a con tact face 28, which co-acts withthe underside of the guide bracket 24, to guide the return stretch ofthe belt and prevent the same from buckling or excessive wear or strain.The slats are secured to the sprocket chain 19 in such a manner thatthey can readily pass over the sprocket wheels.

29 designates the concentrating surface consisting in the presentinstance of a concentrator belt or apron, which latter is mounted on theslatted belt 18, but, in the present instance, it is not fixedly securedthereto and the travel of the concentrator belt 29 is caused by thefrictional engagement thereof with the slatted belt 18. One side of theconcentrator belt 29 is provided [with a reinforcement 30 extendinglongitudinally thereof and which may be formed in any desired manner,but for the purpose of illustration, I have preferred to show the sameas being produced by deflecting the edge of the concentrator belt 29upon itself and securing the parts together in any suitable manner. Theopposite edge of the concentrator belt 29 is provided with a rilfle 31which may be formed in any suitable manner but which, in the presentinstance, is formed by deflecting a portion of the belt upon itself andsecuring the parts in assembled position in any desired manner, suchrifile 31 extending longitudinally of the belt and forming a pool at 32.

The concentrator belt 29 passes over the end rollers 33 which arecarried by the shafts 34 mounted in journals 35 in the brackets 10 and14. The journals at one end of the machine are adjustably mounted, thebrackets 14 being provided with means for longitudinally adjusting suchjournals to adjust the distance of the rollers 33 from each other so asto take up any improper stretch of the concentrator belt 29. In thepresent instance this is accomplished by providing the brackets 14 witha recess 36 in which latter the journal boxes are mounted, said boxesbeing maintained in their adjusted position by means of adjusting screws37. The journal boxes 15 are also longitudinally adjustable, the bracket14 being provided with a recess 38 in which the journal 15 is mounted,the same being longitudinally adjustable owing to the provision of theset screw 39 which contacts with said boX and is carried by the bracket14.

4O designates a roller suitably mounted in the bracket 14 andlongitudinally adjustable therein and engaging the concentrator belt onits return stretch and provides a downwardly inclined portion, asindicated at 41, the purpose of which will hereinafter appear inconnection with the removal of the concentrate from the belt.

The channels 2, in the present instance, have mounted thereon thestandard 42 in which is suitably journaled a shaft 43 having mountedthereon pulleys 44 thereby adapting the same to receive a suitabledriv-- ing belt. The shaft 43 has mounted thereon a friction wheel 45 ofany desired or conventional type. The friction wheel 45 coacts with afriction disk 46 mounted on the shaft 47 suitably journaled in thestandards 42. The shaft 47, as seen most clearly in Fig. 10, has mountedthereon an abutment 48 with which is adapted to enact a collar 49,suitable friction material 50 being interposed between the abutment andcollar.

51 designates a lever, one end of which engages the collar 49 and theother end thereof engaging a fixed abutment 52 on the frame, said leverbeing suitably recessed to receive a spring 53, one end of which abutsagainst the end wall of the recess while the other end thereof contactswith a nut 54 of less diameter than the diameter of the chamher andhaving engagement with rod which may be manually adjusted by means ofthe nut 56 to vary the frictional engagement of the friction wheel 45with the friction disk 46.

The shaft 47 has mounted thereon a sprocket wheel 57 with which latterco-acts a sprocket chain 58, the latter also passing around the sprocketwheel 59 mounted on the shaft 60 suitably j ournaled in the frame workof the machine. The shaft 60 is provided with a worm gear 61 whichco-acts with the gear wheel 62, which latter is mounted on the shaft 12on which the sprocket wheels 13 are mounted, with which the sprocketchain 19 of the slatted belt 18 co-acts. The shaft 43 is provided withan eccentric 63 to which is secured a connecting rod 64, the outer endof which is adjustably secured to the lower framework 8.

65 designates the pulp distributing box which is adjustably mounted onthe bracket 66 carried by the upper frame-work 9 by means of adjustingdevices 67 carried by the bracket 66. The distributing box 65 isprovided with suitable gates 68. The distributing box has connectedtherewith a suitable water conduit 69 which is controlled by means of avalve 70, said conduit also being provided with a valve 71 to controlthe passage of water to the wash water box 72, which latter extendspreferably transversely of the table and is provided with plurality ofdischarge outlets 7 3.

74 designates a waste launder which is adapted to receive the water andwash from the concentrator belt 29, said launder being provided with asuitable conduit 75 which discharges into a receptacle 76. In order thatthe concentrator belt on its return stretch will be properly supported,I provide a desired number of brackets 77 carried by the frame-work 9and having suitably mounted therein rollers 7 8 which engage theconcentrator belt to prevent improper sagging of the same.

The brackets 6 on the lower side of the device are provided with slots79, see more particularly Fig. 9, in which are mounted bolts 80 forsecuring the upper frame-work 9 with respect to the bracket 6 after theframework 9 has been adjusted to the proper pitch, this beingaccomplished by means of an adjusting bolt 61 which is mounted in thebracket 6 and adapted to engage a member 82 carried by the upperframe-work '9, and shown in the present instance as an angle bracketthrough which the bolt 80 extends.

83 designates brackets carried by the upper framework 9 and adapted tocarry suitable anti-friction devices 84, such rollers or otheranti-friction devices, said rollers engaging the underside of the loweredge of the concentrator belt and causing the same to be slightlyelevated to a desired degree in order to produce an elevated edge overwhich no concentrate can flow, and causing the wash water to flow in areverse direction to the travel of the belt to a predetermined dischargepoint which may be varied to suit the desired practice.

The Operation of my novel construction of ore concentrating device canbe now readily understood and is as follows :The machine is driven bymeans of a suitable driving belt co-acting with the pulley 14 on theshaft 43, whereby the friction wheel 45 will impart motion to thefriction disk ib and therefrom owing to the provision of the sprockets57 and 59 and the sprocket chain 58 the shaft 60 will be actuated,thereby causing the worm 61 to actuate the gear 62 and thereby rotatethe shaft 12 on which are mounted the sprocket wheels 18 with whichco-acts the sprocket chain 19 of the slatted belt 18 so that acontinuous longitudinal travel is imparted to the slatted belt 18. Sincethe concentrator belt 29 is loosely mounted on the slatted belt 18 andsupported thereby a longitudinal travel will be imparted thereto owingto its frictional engagement with the slatted belt 18. The lower framework 8, the upper frame work 9 and the operating mechanism carriedthereby have imparted thereto a reciprocating movement owing to theprovision of the ec centric 63 mounted on the shaft 43 and connected bymeans of a suitable connecting rod 64c with the lower frame-work 8, andsince the lower frame-work 8 is mounted on resilient standards 4 areciprocating movement is imparted to the entire frame work and therebyto the concentrator belt 29, which it is to be remembered iscontinuously traveling in a longitudinal direction.

The pulp or ore is conducted by any suitable means to the distributingbox 65 which is located above the upper side of the transverselyinclined concentrating belt 29. The passage of the pulp from thedistributing box 65 to the concentrator belt is controlled by the gates68 and the distributing box is constructed in such a manner that thelighter particles may flow over the gates 68 on to the concentrator belt29.

Owing to the novel manner in which the concentrator belt is mounted andthe novel movement imparted thereto, the pulp which is fed on to the oreconcentrator belt will form a separate zone which for the sake of.

clearness I designate as the ore concentrating zone 85 and in the firststages of the concentrating operation the pulp will flow transverselyacross the ore concentrating zone 85, it being remembered that theconcentrating belt 29 is continually traveling in a longitudinaldirection.

The wash water which is conducted to the washer'box 72 in any desiredmanner is fed therefrom through the discharge ports 73 on to thatportion of the belt which for clearness of description 1 have designatedas the ore washing zone 86. In order to obtain the ore concentratingzone 85 and the ore washing zone 86 the upper frame work is sup portedin a novel manner, whereby the area of such zones may be varied, andthis novel feature of my invention will now be described.

The upper side of the frame-work 9 is adjusted in such a manner that theupper side of the concentrating belt will be in substantially the samehorizontal plane and in order to clearly indicate this I designate thedifferent points of supports on the upper side of the frame-work as 87,88 and 89 and the points of support on the lower side as 90, 91 and 92,it being remembered that the number of supporting points may vary asdesired. In order to provide for this ad justment the bearings arepreferably provided with the reversely inclined faces 97 as will beunderstood by reference to Fig. 11.

In adjusting the machine the points 87 88 and 89, as before stated, arein the same horizontal plane and the point of support 90 is insubstantially the same horizontal plane as the points 87, 88 and 89 butin practice such point 90 is preferably slightly lower than the pointsof support on the upper side. The points 91 and 92 are de pressed adesired distance in order to obtain the desired transverse inclinationof the belt while the same is passing through the ore concentrating zone85, it being apparent that the table is maintained in its adjustedposition by tightening the bolts 80.

Having thus explained the manner in which the table is adjusted thenovel path which the concentrator belt assumes in its travel can bereadily understood. It will be seen that as the ore concentrator belttravels between the points 89, 92 and 88, 91, it will be transverselyinclined, thereby" forming a substantially uniform transversely inclinedplane. As soon, however, as the pulp passes beyond the point 91 theconcentrator belt will form a gradually increasing longitudinallyinclined plane and a diminishing transversely inclined plane, it beingunderstood that this longitudinally incliried plane inclines downwardlyin a reverse direction to the longitudinal travel of ore concentratorbelt, owing to the fact that the upper surface of the roller 33 at theouter end of the machine is higher than the upper surface of the slattedbelt 18 as it passes over the sprocket wheel 17 The longitudinal anddownward inclination of the belt will be in a direction reverse to thatof the longitudinal movement of the belt. The water passing from thedischarge outlets 73 of the washer boX 72 on to the concentrator beltwill flow very gently down this longitudinal inclination of the orewashing zone 86 in a direction reverse to the longitudinal movement ofthe concentrator belt, so that as the wash water comes into contact withthe water and pulp which is flowing transversely across cating movementbeing only suflicient to permit a separation of the metallic contentsfrom the gangue or waste matter. The settled metallic particles havingreached a state of rest are carried in a longitudinal direction to apoint where they are acted upon by the zone 86. The waters of the orewashing zone 85 and the ore concentrating zone 88' converge at a point93 which produces a current flowing in a diagonal direction which issuflicient to carry the separated I gangue, sand or waste matter overthe lower edge of the belt.

During the travel of the concentrator belt a pool is formed owing to theprovision of the riftle 31. As the belt travels in a forward directionthe riffle is assisted by the rollers 8 f in forming an upwardinclination of the lower edge of belt so as to direct the wash waterflowing in a reverse direction to the the concentrator travel of thebelt and prevent its flowing over the edge of the belt at this point.

The metallic content which is retained on 1 the concentrator belt 29 byreason of its higher specific gravity it reaches a point preferably atthe lowest elevation of the concentrator belt on the under or returnstretch, at which it comes into contact with a spray of water from thewater conduit 94:, so that the concentrate is washed from the belt andpasses into a suitable receptacle 95 and is automatically car ried to adesired point of utilization.

As the upper surface of the concentrator belt leaves the first roller 33and engages the slatted belt, the lower edge of the concen-' tratingbelt projects beyond the curved end 23 of the slats and forms a verticaldripping edge 96 until it engages the rollers 84. This vertical edge 96is necessary to obtain a perfectly clean drip, thereby preventing anycapillary flow or working parts of the machine, as has heretofore beenthe case where the ordinary construction of concentrator belt isemployed and where the belt is supported in the usual manner.

It will be apparent to those skilled in this art that in accordance withmy invention a novel movement is imparted to the concentrator belt andowing to such movement and the manner in which the pulp and wash waterare fed I am enabled to obtain highly advantageous results and a veryhigh percentage of the metallic content of the pulp wash waters in theore washing at its lower edge at- 32 is carried over the end roller withthe concentrator belt until.

of water to the sprocket chain separated from the gaiigue. It will befurther apparent to those skilled in this art that owing to the novelconstruction of the bracket 6 and the adjusting means 81 carriedthereby, the pitch of the slatted belt and thereby the pitch of theconcentrator belt loosely mounted thereon, may be adjusted as desired,so that the points of support of the frame, which I have designated at90, 91 and 92, may be adjusted so that the diagonal line 93 intermediatethe ore dressing zone 85 and the ore washing zone 86 may be varied asdesired and not only the pitch of the transversely inclined plane of theore dressing zone 85 may be varied, but also the longitudinalinclination of the ore washing zone 86. The distributing boX may be soadjusted that the pulp will be distributed on the concentrator surface,in such a manner as to permit the sand or heavy portions of the pulp toflow out at suitable points and the lighter portions to overflow.

It will now be apparent that I have devised a novel and useful apparatusfor concentrating ores which embodies the features of advantageenumerated as desirable in the statement of the invent-ion and the abovedescription, and while I have, in the present instance, shown anddescribed a preferred embodiment thereof which has been found inpractice to give satisfactory and reliable results, it is to beunderstood that the same is susceptible of modification in variousparticulars without departing from the spirit or scope of the inventionor sacrificing any of its advantages.

Having thus described my invention, what I claim as new and desire tosecure by Letters Patent, is

1. In an. ore concentrator, a concentrator surface having an oreconcentrating zone and an ore washing zone, means for causing the sameto travel longitudinally in a trans versely inclined rectilinear planein the ore concentrating zone, and then in a transversely andlongitudinally inclined plane in the ore washing zone, pulp feedingmeans, and water feeding means.

2. In an ore concentrator, a concentrator surface, means for causing thesame to travel in a transversely inclined rectilinear plane. and then ina longitudinally inclined and diminishing transversely inclined plane,means for feeding pulp to the upper portion of the concentrator surface,and means for feeding water to the concentrator surface during itstravel. through the longitudinally inclined plane.

3. In an ore concentrator, an endless belt. means for supporting theupper edge thereof in substantially the same horizontal plane, means foradjustably supporting the opposite side of the belt at different pointsin lower horizontal planes than the upper edge .of the belt, to form anore concentrating extending in a transversely and longitudinallyinclined plane.

4. In an ore concentrator, a slatted belt, a concentrator belt looselymounted thereon and driven by its frictional engagement therewith andprovided with pool forming means along its lower side, means forsupporting the slatted belt to form an ore concentrating zone extendingin a transversely inclined rectilinear plane which merges into an orewashing zone extending in a transversely and longitudinally inclinedplane, and driving means for the slatted belt.

5; In an ore concentrator, a transversely inclined slatted belt, meansfor causlng the slatted belt to travel in the ore concentrating zone ina transversely inclined plane and in the ore' washmg zone 1n atransversely and longitudinally inclined plane, a concentrator beltloosely mounted thereon and driven by its frictional engagement.

riffled intermediate surface, and driving means for the slatted belt.

6.. In an ore concentrator, a supporting: frame yieldingly mounted, aslatted belt carried thereby, means for imparting a continuous travel tothe slatted belt, means for reciprocating the frame, a concentrator beltcarried by the slatted belt and driven wholly by its frictionalengagement there with, and means for adjusting the inclination of theslatted belt, to form an ore concentrating zone and an ore washing zonefor the concentrator belt, the latter traveling through the oreconcentrating zone in a transversely inclined plane and through the oreWashing zone in a transversely and longitudinally inclined plane.

7. In an ore concentrator, a frame yieldingly mounted, a slatted beltadjustably mounted in the frame, a concentrator belt carried by theslatted belt and driven by its frictional engagement therewith, meansfor reciprocating the frame, driving means for adjusting the upperportion of the slatted belt near the concentrates discharge end to aplane higher and having a different transverse inclination than the restof the upper stretch of said slatted belt, pulp feeding means, and waterfeeding means.

8. In an ore concentrator, a transversely inclined slatted belt, aconcentrator belt loosely mounted thereon,.means for adjusting theslatted belt near the concentrates discharge end to a plane higher andhaving a. difierent transverse inclination than the rest of the upperstretch of said slatted belt, and driving means for the slatted belt.

9. In an ore concentrator, a transversely inclined slatted belt, aconcentrator belt loosely mounted thereon, and havlng 1ts lower sideextending beyond the side of the slatted belt to form a dripping edge,

means for adjusting the slatted belt near the concentrates discharge endto a plane higher and having a different transverse inclination than therest of the upper stretch of said slatted belt, and driving means forthe slatted belt.

10. In an ore concentrator, a transversely inclined slatted belt, aconcentrator beltloosely mounted thereon and having its lower sideextending beyond the side of the slatted belt to form a dripping edgeand provided with a pool forming rifile in proximity to its drippingedge, means for sup porting the slatted belt to cause the upper stretchof the concentrator belt to travel in a transversely inclined plane andthen in a transversely and longitudinally inclined plane, and drivingmeans for the slat-ted belt.

11. In an ore concentrator, a transversely inclined slatted belt, aconcentrator belt loosely mounted thereon and having its lower sideextending over the ends of the slats to form a substantially verticaldripping edge, means for supporting the slatted belt to cause the upperstretch of the concentrator belt to travel in a transversely inclinedplane and then in a transversely and longitudinally inclined plane,means for preventing the transverse flow of water over the lower side ofthe concentrator belt as it passes through the transversely andlongitudinally inclined plane, and driving means for the slatted belt.

12. In an ore concentrator, a transversely inclined slatted belt, aconcentrator belt loosely mounted thereon, guide brackets carried by theslatted belt, stationary guide members co-acting with said brackets onboth the upper and lower stretch of the slatted belt, means forsupporting the slatted belt to cause the upper stretch of theconcentrator belt to travel in a transversely inclined plane and then ina transversely and longitudinally inclined plane, and driving means forthe slatted belt.

13. In an ore concentrator, a transversely inclined slatted belt, saidslats at, one end being deflected upwardly and at the opposite enddownwardly, a concentrator belt loosely mounted thereon, and overlappingthe downwardly deflected ends of the slats, means for. supporting theslatted belt to cause the upper stretch of the concentrator belt totravel in a transversely inclined plane and then in a transversely andlongitudinally inclined plane, and driving means for the slatted belt.

14-. In an ore concentrator, a transversely inclined slatted belt, aconcentrator belt loosely mounted thereon, means for adjusting theslatted belt near the concentrates discharge end to a plane higher andhaving a different transverse inclination than the rest of the upperstretch of said slatted belt, driving means for the slatted belt, pulpfeeding means, water feeding means, and a receiver along the lower sideof the concentrator belt.

15. In an ore concentrator, a transversely inclined slatted belt, aconcentrator belt loosely mounted thereon, devices for preventingimproper movement of the slatted belt, anti-friction devices forsupporting the concentrator belt on its return stretch, means foradjusting the slatted belt near the concentrates discharge end to aplane higher and having a different transverse inclination than the restof the upper stretch of the slatted belt, and driving means for theslatted belt.

16. In an ore concentrator, a transversely inclined slatted belt, aconcentrator belt loosely mounted thereon and having an oreconcentrating zone and an ore Washing Zone, means for supporting theslatted belt to cause the upper stretch of the concentrator belt totravel through the ore concentrating Zone in a transversely inclinedplane and then through the ore washing zone in a transversely andlongitudinally inclined plane, means for adjusting the inclination ofthe slatted belt to vary the transversely and transversely andlongitudinally inclined planes, and driving means for the slatted belt.a

17 In an ore concentrator, resilient members suitably supported,brackets carried by said members, a framework adjustably carried by saidbrackets, a slatted belt adjust ably mounted in said frame work, meansfor adjusting the opposite sides of said slatted belt to cause the upperstretch of such belt to travel in a transversely inclined plane and thenin a transversely and longitudinally inclined. plane, end rollerscarried by the frame, a concentrator belt mounted on said rollers andhaving frictional engagement with said slatted belt, means forreciprocating the frame-work, and driving means for the slatted belt.

18. In an ore concentrator, resilient mem bers suitably supported,brackets carried by said members, a framework adjustably car.- ried bysaid brackets, a slatted belt adjus ably mounted in said frame work,means for adjusting the opposite sides of the slatted belt to cause theupper stretch of such belt to travel in a transversely inclined planeand then in a transversely and longitudinally inclined plane, endrollers carried by the frame, a concentrator belt mounted on saidrollers and having frictional engagement with said slatted belt, guidescarried by the frame-work, brackets carried by the slats and co-actingwith said guides, means for reciprocating the framework, and drivingmeans for the slatted belt.

19. In an ore concentrator, resilient members suitably supported,brackets carried by said members, a framework adjustably carried by saidbrackets, a slatted belt adjustably mounted in said frame-work to causethe upper stretch of such belt to travel in a transversely inclinedplane and then in a transversely and longitudinally inclined plane, endrollers carried by the frame, a concentrator belt mounted on saidrollers and having frictional engagement with said slatted belt, guidescarried by the frame-work, brackets carried by the slats and each havinga plurality of contact faces, one of such faces co-acting with theguides on the upper stretch of the slatted belt and the other of saidfaces co-acting with said guides on the lower stretch of the belt, meansfor reciprocating the frame-work, and driving means for the slat-tedbelt.

20. In an ore concentrator, the combination with end rollers, of meansfor supporting said rollers in a transversely inclined plane, aconcentrator belt loosely mounted on said rollers, frictional. drivingmeans engaging the upper stretch of the belt intermediate said rollersto impart to the latter a continuous longitudinal travel through atransversely inclined plane in the oredressing Zone of the belt andthrough a transversely and longitudinally inclined plane through the orewashing Zone of the belt, means for feeding pulp to the ore dressingZone of the belt, and means for feeding water to the ore washing Zone ofthe belt in a direction reverse to the longitudinal travel of the beltwhereby the wash and pulp waters will converge in a diagonal line, andmeans for preventing the flow of wash water from the lower side of thebelt as the latter is passing through the ore washing zone.

21. In an ore concentrator, laterally eX tending members suitablysupported, vertically arranged springs carried by said members, bracketssecured to the upper end of said springs, a frame-work secured to saidbrackets, means for adjusting saidframework near the concentratesdischarge end to a plane higher and having a different transverseinclination than the rest of said framework, a yielding support mountedin said frame-work, driving means therefor, a concentrator belt looselymounted on said supportand driven by the frictional engagement of thelatter with the upper stretch of said. belt, means for feeding pulp tosaid belt transversely to the direction its travel, and means forfeeding water to said belt in a reverse direction to its travel.

22. In an ore concentrator, laterally eX- tending members suitablysupported, vertically arranged springs carried by sald memconcentratorbelt loosely mounted on said support and driven by the frictionalengagement of the latter with the upper stretch of said belt, means forfeeding pulp to saidbelt transversely to the direction of its travel,and means for feeding water to said belt in a reverse direction to itstravel.

23. In a device of the character stated, a concentrator belt, and meansin frictional engagement with the under side of the concentratingsurface thereof to cause the concentrating surface to travel in atransversely inclined plane through the ore concentrating zone and totravel through a transversely and longitudinally inclined plane in theore washing zone.

24. In a device of the character stated, a

concentrator belt, means in frictional en-- gagement with the under sideof the concentrating surface thereof to cause the concentrating surfaceto initially travel in a transversely inclined plane which subsequentlymerges into a transversely and longitudinally inclined plane, means forvarying the transversely and longitudinally inclined plane of theconcentrating surface, and means for discharging water against thereturn stretch of the concentrating surface of the belt.

25. The combination in an ore concentrator, ofv a support, rolls carriedby said support, a concentrator belt mounted on said rolls, frictiondriving devices for the concentrator belt, and means for guiding thefriction driving devices to cause the concentrator belt to travelthrough the ore concentrating zone in a transversely inclined plane andthrough the ore washing zone in a transversely and longitudinallyinclined plane.

26. The combination in an -ore concentrator, of a resiliently mountedsupport, rolls carried by said support, means for reciprocating saidsupport, a concentrator belt mounted on said rolls, means frictionallyengaging the concentrator belt to impart a continuous travel. thereto,and devices for guiding said means to cause the concentrator belt totravel through the ore concentrating zone in a transversely inclinedplane and through-the ore washing zone in a transversely andlongitudinally inclined plane.

27. The combination in an ore concentrator, of brackets resilientlysupported, bolts adjustably carried thereby. a frame having a sidethereof supported on said bolts, devices for supporting the oppositeside of said frame in a common horizontal plane and in a plane higherthan the other side of said frame, means for locking said frame in itsadjusted position, an endless belt mounted in said frame, and means fordriving said belt and oscillating said frame.

28. The combination in an ore concentrator, of brackets resilientlysupported,-

bolts adjustably carried thereby, a frame having a side thereofsupported on said bolts, devices for supporting the other side of saidframe in a common plane and in a plane higher than the other sidethereof, an ore concentrating belt mounted in said frame, driving meanstherefor, and fastening devices cooperating with said bracket and framefor maintaining the latter in its adjusted position.

29. The combination in an ore concentrator, of brackets resilientlysupported, vertically adjustable bolts carried thereby, a frame having aside thereof supported on said bolts, devices for supporting the otherside of said frame in a horizontal plane and in a plane higher than theother side thereof, an ore concentrator belt mounted in said frame,driving means for the belt, and fastening devices carried by saidbrackets and vertically adjustable with respect thereto and cooperatingwith the frame to maintain the same in its adjusted position.

30. The combination of a concentrator belt, aslatted belt forfrictionally driving the latter, the slats of the slatted belt havingthe sides thereof deflected downwardly, a concentrator belt supported onthe slatted belt and extending over the downwardly deflected sidesthereof, and actuating means for the slatted belt.

31. The combination of a concentrator belt, a slatted belt forfrictionally driving the latter, the slats of the slatted belt havingone end thereof deflected downwardly, and the other end thereofdeflected upwardly, said ends being covered by said belt, actuatingmeans for the slatted belt, and means for guiding the slatted belt tocause it to travel in predetermined transversely inclined planes in itsupper stretch.

32. The combination in an ore concentrator of a transversely inclinedslatted belt, having an ore concentrating zone and an ore washing zoneand driving means therefor, a concentrator belt driven by its frictionalengagement with the concentrator belt and having its lower sideextending beyond the side of the slatted belt to form a dripping ed e,means for feeding pulp to the concentrating zone, and rollers engagingthe lower side of the concentrator belt as it passes through the orewashing zone to prevent flow of water thereover.

33. The combination of a frame resiliently supported and having butthree points of support upon each side, a slatted belt mountcause theconcentrator belt to travel through ed in the frame, means formaintaining the the ore concentrating zone in a rectilinear three pointsof support on one side in a plane, and through the ore Washing zonecommon horizontal plane, means for adj ustin a longitudinally andtransversely inclined 5 ing the three points of support on the plane,and driving means for the slatted 15 other side to vary the transverseand longibelt.

tudinal inclination of the belt, a concen- PETER H. CRAVEN. trator beltdriven by its frictional engage- Witnesses: ment with the slatted belt,means for guid- H. S. FAIRBANKS,

1 ing the upper stretch of the slatted belt to C. D. MOVAY.

Copies of this patent may be obtained for five cents each, by addressingthe Commissioner of Patents, Washington, D. C.

